Ni-BASE SINGLE CRYSTAL SUPERALLOY

摘要

A Ni-base single crystal superalloy which has a chemical composition, in wt ratio: Al: 5.0 wt % or more and 7.0 wt % or less, Ta: 4.0 wt % or more and 10.0 wt % or less, Mo: 1.1 wt % or more and 4.5 wt % or less, W: 4.0 wt % or more and 10.0 wt % or less, Re: 3.1 wt % or more and 8.0 wt % or less, Hf: 0 wt % or more and 0.50 wt % or less, Cr: 2.0 wt % or more and 5.0 wt % or less, Co: 0 wt % or more and 9.9 wt % or less, Ru: 4.1 wt % or more and 14.0 wt % or less and the balance: Ni and inevitable impurities. The Ni-base single crystal superalloy allows the prevention of precipitation of a TCP phase at a high temperature, which results in the improvement of the strength of the superalloy.